EKKO EK20R Service Manual page 11

(1) Transmission failure causes and troubleshooting methods
fault
Decline in efficiency
The spill
(1) Multi-way valve failure causes and troubleshooting methods
fault
External leakage
Stem cannot be reset
cause
1.
1. The friction plate is stuck or worn.
2. Bearing damage.
3. Check whether the lubricating oil road
is blocked.
1. The gasket is damaged.
2. Rubber parts are aged or damaged.
3. Parts are damaged and cracked.
cause
The sealing part of the lip is worn
The valve stem seal is damaged
The sealing part of the lip is embedded
with foreign matter such as paint and
dust
O-ring damaged (cut ring)
The sealing ring between valve discs is
aged and deformed
There is scratch (new valve) or foreign
matter in the sealing plane of valve disc
Valve body hole and sealing ring slot
hole different (new valve)
Back pressure exceeds allowable value
The bolts between plates are not evenly
stressed or tightened
The control mechanism is not flexible
The stem was jammed with dirt
The return spring is deformed or broken
Stem deformation caused by external
Check for gluing, uneven contact or
warping of the friction plate.
Replace the bearing
dredge
Replace gasket
Replacement parts
replace
Replace seal ring
Replace stem or disc sub assembly
Clean the paint and other foreign
matters embedded in the lip sealing
part, pay attention to not damage
the valve stem and sealing surface
Replace the O-ring seal
Replace the new sealing ring
Remove foreign matter or replace
valve disc
Replace the valve plates
Check the loop and lower the return
oil pressure to the specified value
Tighten the stud bolts with specified
torque
Check the control lever
Clean valves, fuel tanks and
pipelines
Remove the back cover for
inspection and replace the spring
Refit stem or replace valve sub
9
maintenance
maintenance